
<     jzero_far((void *) output_buf[row], (size_t) (width * sizeof(JSAMPLE)));
---
>     if (output_buf[row] != NULL) {
>         size_t size = width * sizeof(JSAMPLE);
>         if (size > 0 && size <= output_buf_size) {
>             jzero_far((void *) output_buf[row], size);
>         } else {
>             /* Handle out-of-bounds error */
>         }
>     } else {
>         /* Handle null pointer error */
>     }
